The present invention is generally directed towards an air induction system in a motor vehicle. The air induction system comprises an air filter, a clean air duct, a mass air flow sensor housing duct, a mass air flow sensor and a flow conditioning device. The flow conditioning device is disposed inside a mass air flow sensor housing duct. The flow conditioning device is located upstream from the mass air flow sensor. The air flowing through the clean air duct encounters turbulence near the walls of the duct. The flow conditioning device prevents the turbulent air from flowing into the mass air flow sensor.
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9. A flow conditioning device installed in an air induction system for transporting ambient air into an engine of an automobile, the air induction system including an air filter for removing debris from the ambient air, a duct in communication with the air filter, wherein the duct defines an air passage for carrying the ambient air and a sensor to measure the amount of air inducted into the engine, the device comprising:
a longitudinally extending body mounted in the duct, wherein the longitudinally extending body is disposed downstream from the air filter and upstream from the sensor, wherein the longitudinally extending body has an exterior surface and an interior surface, such that the interior surface defines an air flow passageway, the passageway having a conical first portion for allowing air to enter the longitudinally extending body and a cylindrical second portion to allow the air to exit the longitudinally extending body.
1. An air induction system for transporting ambient air into an engine of an automobile, the system comprising:
an air filter for removing debris from the ambient air;
a duct in communication with the air filter, wherein the duct defines an air passage for carrying the ambient air.
a flow conditioning device positioned downstream from the air filter, the flow conditioning device having a longitudinally extending body, wherein the longitudinally extending body has an exterior surface and an interior surface and wherein the interior surface defines an air flow passageway, the air flow passageway having a conical first portion for allowing air to enter the flow conditioning device and a cylindrical second portion to allow the air to exit the flow conditioning device, thereby conditioning the air passing through; and
a sensor mounted to the duct, wherein the sensor is disposed downstream from the flow conditioning device, wherein the sensor is positioned to receive the conditioned air.
26. An air induction system for transporting ambient air into an engine of an automobile, the system comprising:
an air filter for removing debris from the ambient air;
a duct in communication with the air filter, the duct defining an air passage for carrying the ambient air and further including a clean air portion and a sensor housing portion disposed in the sensor housing portion;
a flow conditioning device positioned downstream from the air filter, the flow conditioning device having a longitudinally extending body, the longitudinally extending body having an exterior surface and an interior surface, the interior surface defining an air flow passageway, the longitudinally extending body being attached to the sensor housing portion by at least one rib, the at least one rib extending radially away from the external surface of the longitudinally extending body, thereby conditioning the air passing through; and
a sensor mounted to the duct and being disposed downstream from the flow conditioning device, the sensor being positioned to receive the conditioned air.
18. An air induction system installed in a vicinity of an engine for transporting air from the outside to the engine in an automobile, wherein the air flowing from the outside to the engine defines an air flow path, the system comprising:
an air filter for cleaning the air drawn from the outside;
a clean air duct wherein one end of the duct is connected to the air filter, the duct defines an exterior surface and an interior surface, wherein the interior surface allows air to flow to the engine, wherein the air is more turbulent proximate an interior wall of the interior surface than at the center of the interior surface of the duct;
a housing duct connected to a second end of the clean air duct.
a means for conditioning air flow wherein the means is positioned upstream from the sensing device and downstream from the air filter, the means having a longitudinally extending body, wherein the longitudinally extending body has an exterior surface and an interior surface and wherein the interior surface defines an air flow passageway, the air flow passageway having a conical first portion for allowing air to enter the means for conditioning air flow and a cylindrical second portion to allow the air to exit the means for conditioning air flow, thereby conditioning the air passing there through; and
a sensing device with an opening mounted to the housing duct wherein the sensing device is disposed downstream from the means for conditioning air flow, wherein the opening receives the conditioned air.
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This invention generally relates to an air induction system in the engine of an automobile. More specifically to a flow conditioning device installed in the air induction system.
Internal combustion engines today include electronic controls to provide optimal engine operation. One critically important sensor for achieving optimal engine control is a mass air flow sensor for measuring air intake into the internal combustion engine.
It is critical that the mass air flow measurement is accurate in order to provide optimal engine operation. One significant problem affecting the mass air flow measurement is the turbulence in the air flow that could result in high noise-to-signal output. Prior art flow conditioning devices have attempted to address this problem by providing devices that reduce the turbulence of the entire flow field. Typically, the prior art devices use either a grid or a screen. While prior art devices such as one discussed, reduce the turbulence of the entire flow field, they are susceptible to freezing and therefore cutting off air flow to the engine. Additionally, these devices are costly to manufacture.
Therefore, there is a need in the automotive industry to improve the design of the flow conditioning devices that deliver low turbulent flow field to the mass air flow sensor.
In one aspect of the present invention, an air induction system installed in a motor vehicle is provided. The air induction system comprises an air filter, a clean air duct, a mass air flow sensor, a mass air flow sensor housing duct and flow conditioning device.
In yet another aspect of the present invention, a flow conditioning device is disposed at the center of the mass air flow sensor housing duct. The flow conditioning device is located upstream from the mass air flow sensor and downstream from the air filter in the air flow path. The flow conditioning device has an inlet for intaking the air from the clean air duct and an outlet for the air to exit to the mass air flow sensor.
In yet another aspect of the present invention, the entrance of the mass air flow sensor is positioned near the outlet of the flow conditioning device. therefore the air exiting the flow conditioning device enters the mass air flow sensor entrance. The turbulent flow near the wall of the mass air flow sensor housing duct bypasses the flow conditioning device and the entrance of the mass air flow sensor.
In yet another aspect of the present invention, the outlet of the flow conditioning device is provided with a constant area section such that the air flow to the entrance of the mass air flow sensor is substantially at a zero angle.
Further features and advantages of the invention will become apparent from the following discussion and the accompanying drawings in which:
The following description of the preferred embodiment is merely exemplary in nature and is in no way intended to limit the invention or its application or uses.
Referring in particular to
The air induction system 10 comprises a dirty air duct 13, an air filter 14, a clean air duct 16, a mass air flow sensor (MAFS) housing duct 18, a mass air flow sensor (MAFS) 20 and a flow conditioning device 22. The air induction system 10 also comprises a throttle body 24 connected to the MAFS housing 18. The drawings the throttle body 24 is typically connected to an intake manifold 25. The intake manifold 25 is connected to the engine 11. The throttle body 24 used in the present invention is well known in the art and therefore is not explained in details.
The air filter 14 functions to filter the air drawn or inducted from the outside before it is delivered to the engine 11. The air filter 14 used in the present invention is well known in the art and therefore not explained in detail. The air filter 14 is connected to the clean air duct 16 such that the air after being filtered by the air filter 14 flows to the clean air duct 16.
Referring in particular to
With continued reference to
The air flowing through the bend 32 may result in adverse pressure gradient due to the air encountering the interior wall 40 of the passage 30 in the clean air duct 16. Due to the air encountering the interior wall 40, the air shown by arrows 34 near the walls 40 of the clean air duct 16 is more turbulent than the air shown by arrow 42 around the center of the clean air duct 16. Turbulence is also caused due to inconsistent air flow 12 due to surface imperfections in the clean air duct 16 or the MAFS housing duct 18. As will be explained later, the flow conditioning device 22 will prevent the air 34 near the walls 40 of the clean air duct 16 to flow into the mass air flow sensor 20.
With continued reference to
Referring in particular to
The flow conditioning device 22 preferably has a longitudinally extending body, extending longitudinally towards the MAFS opening 40. Alternatively, it may have a circular or a conical body. The flow conditioning device 22 defines a longitudinal axis 48 that is parallel to the air flow 12. The flow conditioning device 22 has an external surface 50 and an interior surface 52. The internal surface 52 has an air flow passageway 54 (as shown in
With particular reference to
In order to assist the flow of air towards the reduced diameter 68 near the outlet 62, internal wall 70 at the interior surface 52 slope such that near the outlet 62, a portion of the walls 70 are substantially parallel to the air flow 12. Preferably, near the outlet 62, flow conditioning device 22 has a constant area section such that the air flow to the MAFS entrance 44 is substantially at a zero angle. Alternatively, the air flow to the MAFS entrance 44 may be at an inclined angle. Near the inlet 60, the walls 70 are preferably at an angle ø with respect to the longitudinal axis 48. Preferably, the angle between the wall 70 and the axis 48 is in the range of 0° to 10°. Therefore, as the air flows from the inlet 60 to the outlet 62 it accelerates before entering the MAFS entrance 44. Therefore, near the inlet 60, the interior surface 52 is conical and near the outlet 62, the interior surface 52 is cylindrical.
Referring in particular to
With reference to
Referring in particular to
As seen from the above, since the flow conditioning device 22 can be manufactured separate from the other components in air induction system 10, it allows flexibility in the positioning and the dimensions in manufacturing of the flow conditioning device 22. For example, depending on the packaging of the air induction system 10, the distance L1 can be either increased or decreased. Additionally, the length and the distance from MAFS 20 can be also changed.
As any person skilled in the art will recognize from the previous description and from the figures and claims, modifications and changes can be made to the preferred embodiment of the invention without departing from the scope of the invention as defined in the following claims.
Abdolhosseini, Reza, Bielicki, Jim
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